At the top of Calibre Companion it says "Search not Active." How can I activate search? I looked in the setting & could not find any information on this. I have a Nook HD+ & right now I can only use the main search function on the device. I can't search from within Calibre Companion. Since i have 600+ books this is a bit inconvenient.

Tap the magnifying glass on CC's top bar and enter a calibre-like search expression. You can also long press on a group item (e.g. an author or a series) to limit what cc shows, similar to the new virtual library feature in calibre.